Patents by Inventor Yuichiro Itai
Yuichiro Itai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20070205411Abstract: An organic electroluminescence device of multi-photon emission mode which includes plural light emission layers and at least one charge generation layer between a pair of electrodes, arranged in a film thickness direction thereof, wherein the charge generation layer includes at least one p-doped layer and at least one n-doped layer, and further includes an alkali metal layer and a layer containing a hole transport material between the p-doped layer and the n-doped layer. An organic electroluminescence device of multi-photon emission mode exhibiting little unevenness in luminance even in a large-area format electroluminescence device is provided.Type: ApplicationFiled: March 2, 2007Publication date: September 6, 2007Inventor: Yuichiro Itai
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Publication number: 20070181876Abstract: There is provided an organic electroluminescence device that is high in light emitting efficiency and excellent in driving durability, which contains at least a light emitting layer between an anode and a cathode opposing each other, and further has either 1) an organic layer containing at least a first acceptor and a second acceptor between the light emitting layer and the anode, in which the first acceptor is a metal compound and the second acceptor is an organic compound which does not contain a metal, or 2) an organic layer containing a metal oxide as an acceptor between the light emitting layer and the anode, in which a concentration of the metal oxide in the organic layer is varied in a thickness direction and the concentration is lower in a portion near the light emitting layer than a portion near the anode.Type: ApplicationFiled: February 5, 2007Publication date: August 9, 2007Inventor: Yuichiro Itai
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Patent number: 7250227Abstract: The present invention relates to highly reliable organic EL elements that can provide higher luminance with lower voltage and exhibit lower leak current at negative biases and appropriate diode properties. The organic EL element comprises a positive hole injecting layer, and a perfluoropolyether compound is incorporated into the positive hole injecting layer. Preferably, the perfluoropolyether compound is expressed by formula (1) or (2), R1—Rf—R2 ??formula (1) Rf—R3 ??formula (2) in which, R1, R2, and R3 represents one of a hydrogen atom, a fluorine atom, and a substituted group; Rf represents the perfluoropolyether skeleton expressed by the formula (3), in which, R4 and R5 represent general formula —CpF2p+1; n, m, x, and y are each an integer.Type: GrantFiled: July 29, 2005Date of Patent: July 31, 2007Assignee: Fujifilm CorporationInventors: Yuichiro Itai, Takashi Iida, Jun Kodama
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Patent number: 7233105Abstract: In an organic EL device disclosed, there are stacked sequentially on a glass substrate an anode, a first carrier transportation layer, a second carrier transportation layer, a light emission layer, a third carrier transportation layer, a fourth carrier transportation layer, an electron transportation layer, and a cathode. The first carrier transportation layer is formed from a material having an ionization potential Ip lower than the ionization potential Ip of the second carrier transportation layer, and the third carrier transportation layer is formed from a material having an electron affinity Ea less than the electron affinity Ea of the fourth carrier transportation layer.Type: GrantFiled: December 27, 2004Date of Patent: June 19, 2007Assignee: Fuji Film CorporationInventors: Yuichiro Itai, Masaya Nakayama, Masaru Kinoshita, Jun Kodama
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Patent number: 7193361Abstract: The present invention is an organic EL device in which an anode, a hole injection layer, a first carrier transportation layer, a first luminescent layer, a second carrier transportation layer, a second luminescent layer, an electron transportation layer, and a cathode are formed on a glass substrate in order, wherein layers with a smaller electron affinity Ea and a larger energy gap Eg than those of the first and second luminescent layers are employed for the first and second carrier transportation layers, so as to enhance the emission efficiency of the first and second luminescent layers.Type: GrantFiled: January 24, 2005Date of Patent: March 20, 2007Assignee: Fuji Photo Film Co., Ltd.Inventors: Masaru Kinoshita, Yuichiro Itai, Masaya Nakayama, Jun Kodama
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Patent number: 7045953Abstract: An organic EL device includes a transparent substrate (31), an anode (32), a hole injection layer (33), a hole transport layer (34), an luminescent layer (35), an electron transport multilayered body (36), a cathode-side electron transport layer (37), and a cathode (38) formed on the substrate (31) in that order. The electron transport multilayered body (36) includes alternate layered two kinds of electron transport layers (36A, 36B) having electron affinities that are different from each other. Increasing the amount of electron current injected from the cathode (38) for balancing with the amount of hole current, and enhancing luminous efficiency.Type: GrantFiled: February 24, 2005Date of Patent: May 16, 2006Assignee: Fuji Photo Film Co., Ltd.Inventors: Masaya Nakayama, Yuichiro Itai, Masaru Kinoshita, Jun Kodama
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Publication number: 20060008675Abstract: The present invention relates to highly reliable organic EL elements that can provide higher luminance with lower voltage and exhibit lower leak current at negative biases and appropriate diode properties. The organic EL element comprises a positive hole injecting layer, and a perfluoropolyether compound is incorporated into the positive hole injecting layer. Preferably, the perfluoropolyether compound is expressed by formula (1) or (2), R1—Rf—R2??formula (1) Rf—R3??formula (2) in which, R1, R2, and R3 represents one of a hydrogen atom, a fluorine atom, and a substituted group; Rf represents the perfluoropolyether skeleton expressed by the formula (3), in which, R4 and R5 represent general formula —CpF2p+1; n, m, x, and y are each an integer.Type: ApplicationFiled: July 29, 2005Publication date: January 12, 2006Applicant: FUJITSU LIMITEDInventors: Yuichiro Itai, Takashi Iida, Jun Kodama
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Publication number: 20050179370Abstract: An organic EL device includes a transparent substrate (31), an anode (32), a hole injection layer (33), a hole transport layer (34), an luminescent layer (35), an electron transport multilayered body (36), a cathode-side electron transport layer (37), and a cathode (38) formed on the substrate (31) in that order. The electron transport multilayered body (36) includes alternate layered two kinds of electron transport layers (36A, 36B) having electron affinities that are different from each other. Increasing the amount of electron current injected from the cathode (38) for balancing with the amount of hole current, and enhancing luminous efficiency.Type: ApplicationFiled: February 24, 2005Publication date: August 18, 2005Applicant: FUJITSU LIMITEDInventors: Masaya Nakayama, Yuichiro Itai, Masaru Kinoshita, Jun Kodama
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Publication number: 20050142384Abstract: An organic electroluminescence device is disclosed. The device includes an anode, a cathode formed above the anode, a light-emitting layer containing an organic light-emitting material that is formed between the anode and the cathode, a hole-injecting layer on the anode that includes a hole-transporting material and an acceptor, and an electron-transporting suppressing stack between the hole-injecting layer and the light-emitting layer. The electron-transporting suppressing stack consists of multiple carrier-transporting layers, and forms energy barriers relative to electrons flowing from the light-emitting layer to the hole-injecting layer.Type: ApplicationFiled: February 23, 2005Publication date: June 30, 2005Applicant: FUJITSU LIMITEDInventor: Yuichiro Itai
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Publication number: 20050122038Abstract: The present invention is an organic EL device in which an anode, a hole injection layer, a first carrier transportation layer, a first luminescent layer, a second carrier transportation layer, a second luminescent layer, an electron transportation layer, and a cathode are formed on a glass substrate in order, wherein layers with a smaller electron affinity Ea and a larger energy gap Eg than those of the first and second luminescent layers are employed for the first and second carrier transportation layers, so as to enhance the emission efficiency of the first and second luminescent layers.Type: ApplicationFiled: January 24, 2005Publication date: June 9, 2005Applicant: FUJITSU LIMITEDInventors: Masaru Kinoshita, Yuichiro Itai, Masaya Nakayama, Jun Kodama
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Publication number: 20050104084Abstract: In an organic EL device disclosed, there are stacked sequentially on a glass substrate an anode, a first carrier transportation layer, a second carrier transportation layer, a light emission layer, a third carrier transportation layer, a fourth carrier transportation layer, an electron transportation layer, and a cathode. The first carrier transportation layer is formed from a material having an ionization potential Ip lower than the ionization potential Ip of the second carrier transportation layer, and the third carrier transportation layer is formed from a material having an electron affinity Ea less than the electron affinity Ea of the fourth carrier transportation layer.Type: ApplicationFiled: December 27, 2004Publication date: May 19, 2005Applicant: FUJITSU LIMITEDInventors: Yuichiro Itai, Masaya Nakayama, Msaru Kinoshita, Jun Kodama
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Patent number: 6890585Abstract: A method of manufacturing a magnetic recording medium which includes a bonding sub-layer substantially and forms a lubricant layer having a width. A method of manufacturing a magnetic recording medium includes the steps of: a) laminating an underlayer, a magnetic layer for recording, and a protection layer of amorphous carbon on a substrate of the magnetic layer for recording medium in turn, and b) repeating a process to the protection layer of amorphous carbon comprising an application process of applying a lubricant, a subsequent ultraviolet rays treatment process, and a subsequent washing process for removing the lubricant which is not connected to the protection layer of amorphous carbon, the process being repeated plural times.Type: GrantFiled: August 31, 2001Date of Patent: May 10, 2005Assignee: Fujitsu LimitedInventors: Yuichiro Itai, Yoshiharu Kasamatsu
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Patent number: 6878398Abstract: A method of manufacturing a magnetic recording medium which includes a bonding sub-layer substantially and forms a lubricant layer having its enough width. A method of manufacturing a magnetic recording medium includes the steps of: a) laminating an underlayer, a magnetic layer for recording, and a protection layer of amorphous carbon on a substrate of the magnetic recording medium in turn, and b) repeating a progress to said protection layer of amorphous carbon comprising an application process of applying a lubricant, a subsequent ultraviolet rays treatment process, and a subsequent washing process for removing the lubricant which is not connected to the protection layer of amorphous carbon plural times.Type: GrantFiled: May 4, 2004Date of Patent: April 12, 2005Assignee: Fujitsu LimitedInventors: Yuichiro Itai, Yoshiharu Kasamatsu
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Publication number: 20040206450Abstract: A method of manufacturing a magnetic recording medium which includes a bonding sub-layer substantially and forms a lubricant layer having its enough width. A method of manufacturing a magnetic recording medium includes the steps of: a) laminating an underlayer, a magnetic layer for recording, and a protection layer of amorphous carbon on a substrate of the magnetic recording medium in turn, and b) repeating a progress to said protection layer of amorphous carbon comprising an application process of applying a lubricant, a subsequent ultraviolet rays treatment process, and a subsequent washing process for removing the lubricant which is not connected to the protection layer of amorphous carbon plural times.Type: ApplicationFiled: May 4, 2004Publication date: October 21, 2004Applicant: Fujitsu LimitedInventors: Yuichiro Itai, Yoshiharu Kasamatsu
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Publication number: 20030026918Abstract: Ultraviolet rays are radiated over a lubricant film formed on the surface of a recording medium such as a hard disk. The recording medium is then subjected to exposure to bases. The radiation of the ultraviolet rays allows the lubricant film to uniformly spread over the surface of the recording medium. The repellency can be enhanced over the surface of the recording medium. The friction can be reduced on the recording medium. Moreover, when the recording medium is exposed to the base, organic acid existing on the surface of the recording medium and/or in the lubricant film can be transformed into salt. The organic acid can be washed off or removed from the surface of the recording medium and/or out of the lubricant film in this manner. Less organic acid greatly contributes to prevention of generation of corrosion mounds on the recording medium over a longer period.Type: ApplicationFiled: December 6, 2001Publication date: February 6, 2003Applicant: FUJITSU LIMITEDInventors: Yuichiro Itai, Masaki Katayama, Yoshiharu Kasamatsu
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Patent number: 6511716Abstract: Ultraviolet rays are radiated over a lubricant film formed on the surface of a recording medium such as a hard disk. The recording medium is then subjected to exposure to a bases. The radiation of the ultraviolet rays allows the lubricant film to uniformly spread over the surface of the recording medium. The repellency can be enhanced over the surface of the recording medium. The friction can be reduced on the recording medium. Moreover, when the recording medium is exposed to the base, organic acid existing on the surface of the recording medium and/or in the lubricant film can be transformed into salt. The organic acid can be washed off or removed from the surface of the recording medium and/or out of the lubricant film in this manner. Less organic acid greatly contributes to prevention of generation of corrosion mounds on the recording medium over a longer period.Type: GrantFiled: December 6, 2001Date of Patent: January 28, 2003Assignee: Fujitsu LimitedInventors: Yuichiro Itai, Masaki Katayama, Yoshiharu Kasamatsu
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Patent number: 6468600Abstract: A method of texturing includes the process of enhancing the hydrophilicity on the surface of a substrate for a recording medium. A texture is then formed on the surface of the substrate with an aqueous slurry in which abrasive grains are dispersed. The surface of the substrate is expected to exhibit an enhanced property of wetness to the aqueous slurry. The aqueous slurry easily spreads over and contacts the surface of the substrate even from the initial stage of the process. The abrasive grains in the aqueous slurry are allowed to uniformly spread over the surface of the substrate. Establishment of the texture can be started on the surface of the substrate at an earlier stage of the process. Even with the abrasive grains of a smaller grain size, a fine and uniform texture of a predetermined surface roughness can be established on the surface of the substrate within a shortened period.Type: GrantFiled: February 4, 2002Date of Patent: October 22, 2002Assignee: Fujitsu LimitedInventors: Susumu Yoshida, Yuichiro Itai, Yoshiharu Kasamatsu, Toshiro Takahashi
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Publication number: 20020043332Abstract: A method of manufacturing a magnetic recording medium which includes a bonding sub-layer substantially and forms a lubricant layer having its enough width. A method of manufacturing a magnetic recording medium includes the steps of: a) laminating an underlayer, a magnetic layer for recording, and a protection layer of amorphous carbon on a substrate of the magnetic recording medium in turn, and b) repeating a progress to said protection layer of amorphous carbon comprising an application process of applying a lubricant, a subsequent ultraviolet rays treatment process, and a subsequent washing process for removing the lubricant which is not connected to the protection layer of amorphous carbon plural times.Type: ApplicationFiled: August 31, 2001Publication date: April 18, 2002Applicant: FUJITSU LIMITEDInventors: Yuichiro Itai, Yoshiharu Kasamatsu